From Washington.
Washington, April 17.
--It is reported, but not yet confirmed, that Government has called out 150,000 additional troops.
It is stated that engineers have selected positions for the erection of batteries in and around Washington for the protection of the city.
Col. Charles Lee Jones, Adjutant General of the District Militia, threw up his commission to-day.
The Rhode Island volunteers are ordered to Washington.
Capt. Stuart, of the splendid Georgetown Cavalry, has resigned.
Every public building in this city is now openly guarded, day and night, by enlisted soldiers.
The street in front of the Post-Office is filled with provisions in barrels and boxes, and guarded.
An ammunition train passed along the Avenue to-day, toward Georgetown, probably to supply the battery which is said to be erecting on the Heights of Georgetown.
The Light Artillery are to-night on the Maryland approaches to the city.
Carrington, formerly of Virginia, is appointed District Attorney here.
J. M. Fleming is appointed District Attorney for Eastern Tennessee. 